ac/dc drives

The sliding contact that rides against the commutator segments and is used to connect the armature to the power circuit is called?

Brushes

how are the winding circuits determined for a duel-voltage delta connection motor?

Continuity check

The application of force over a distance is called?

Work

How many watts are in one Horsepower?

746W

Which DC motor provides the best torque and speed control?

Compound Motor

what is required for working in confined spaces based on safety for workers?

Confined Space Permit

What component in a split phase motor removes the starting winding from the circuit to allow the motor to run only with the running windings?

Contrifugal Switch

What is an Induction motor?

Has no physical connection between the motor and stator.

List an advantage of AC Induction Motors.

Less Maintness

When troubleshooting reversing control circuits, what is used to illustrate circuit logic?

Line diagram circuit

Describe what shaded pole is in an AC shaded pole motor.

Solid Strand of copper wire

The process of turning a motor on and off repeatedly?

overcycling

what is the first step in troubleshooting a 3 phase motor?

Check Voltage

What component in a converter changes AC voltage to DC voltage?

Diode

A safety label that indicates a potentially hazardous situation that if not avoided could result in serious injury or death.

Warning

An electric charge at rest is called

Static

In a DC shunt field motor, what does self-excited mean?

The armature in the field is the same power supply

List three elements to start and sustain a fire

1. Oxygen 2. Fuel Source 3. Spark

What is the stationary part of a DC motor called?

Field Windings

What was the control voltage for the magnetic motor starter that we discussed in class?

110V

The _________ circuit is the simplified when using a motor drive because there is no need for a reversing part.

Power

Troubleshooting

finding a problem and removing or fixing the problem

Except in an emergency, who is allowed to remove a lock out/ tag out?

the person who put the lock on

An extremely high temperature discharge produced by an electrical fault in the air is called?

Arc Flash

what is the mist common type of injury resulting in lost time in the work place?

Back injury

What component in the inverter section controls the DC voltage and produces a simulated AC sin wave.

Bipolar Transistor

When a motor is derated , what affect does it have on the motor?

Cause it to slow

What device is used in a split phase motor to remove the starting windings?

Centrfugal switch

A DC shunt motor has the armature winding's connected in parallel with the ________ winding.

Field

What determines the maximum rated acceleration time if an AC motor?

Frame Size

A device used to detect an imbalance of current in the circuit pathways and opening the circuit.

Ground Fault Circuit Interupter

What type of motor has no physical electrical connection to the rotor?

Induction Motor

List two sections that all electrical, hydraulic and pneumatic components have in common

Inputs and Outputs

Definition of Ohms Law

The relationship between voltage, current, and resistance

What is the first step in troubleshooting a magnetic motor starter?

Voltage

Which DC motor provides excellent torque with no speed control?

Series

a machine that converts electrical energy to mechanical energy.

motor

What is the normal control voltage and type for a drive?

12 /24 DC

When testing voltage at the output of a drive, the voltage between each line should not vary more than what percentage?

2%

The normal dual voltage rating of industrial motors is.

230 / 460 Volts

How much resistance is allowed for grounding systems for building and equipment?

25 Ohms

How many types of DC Motors did we discuss in class?

5

How much current imbalance does it take to trip a GFCI?

5mA

How many AC Induction Motors have we Discussed?

6

How many steps are required to properly lockout/ tagout a piece of equipment?

6

How many transistors are used in a drive to produce a simulated 3 phase AC sin wave?

6

Overhead power conducts above _________ Volts are normally bare.

600

What is the leading major cause of motor failure?

Overheating

which DC motor has only the armature winding energized.

Permanent Magnet

A field _______ is used to adjust the speed of a DC shunt motor.

Rheostat

What device is used to control the speed of a DC shunt motor?

Rheostat

a temporary or movable platform for workers to stand on when working above the floor.

Scaffle

A capacitor run motor has the capacitor and the________ connected in series at all times.

Starting windings

A DC series motor has the field connected in series with ?

Armature

Which DC motor uses a permanent magnet for the armature?

Stepper Motor

The process of turning a motor on and off momentarily?

Jogging

List the five components of a control circuit.

1 PS 2 Conductor 3 Control Device 4 Loads 5 OL

List the labels for the four wire on a DC shunt motor.

1. A1, A2 2. F1, F2

List the five components of a DC Motor.

1. Armature 2. Brushes 3. Field Windings 4. Pigtail 5. Commutator

List the three main sections of an AC motor drive.

1. Converter 2. DC Bus 3. Inverter

List three requirements for Arc rated clothing?

1. No Tear 2. Fire retardant 3. Heat resistant

In an AC/DC Drive what frequency is used to control motor speed?

Fundemental

If line voltage exceeds 50KV, what is the minimum overhead line clearance?

10 Feet

The current for a motor must be within what percentage of the motor nameplate rated current.

10%

Fires that include burning oil, gas, grease, paint, and other liquids that convert to a gas when heated are what class of fire?

Class B

What class of fire is associated with electrical or electronic equipment?

Class C

What type of measurements are taken to determine an overload condition of a motor?

Current

What type of measurements are taken to determine the condition of a motor?

Current

A DC motor that offers high starting torque and constant speeds?

DC compound

An electrical device used to control the speed of a 3 phase induction motor.

Drive

A Discharge of electric current across an air gap is called?

Electric Arc

A shock that results any time a body becomes part of an electrical circuit is Called?

Electric Shock

A sensor that sends feedback to the control circuit is called an.

Encoder

When removing fuses, use an approved fuse puller and break contact on the _____ side of the circuit first?

Line

An electrical devise used to turn motors on and off and provide overload protection.

Magnetic Motor Starter

Where can the correct voltage and current of a motor be found ?

Nameplate

What national organization sponsors the development of the National Electrical Code?

Occupational Safety and Health Administration

How do you determined phase to phase voltage for a 3 phase motor.

check phase to phase

In reference to the right hand rule, what does the middle finger indicate?

direction of current flow

An electrical circuit with an incomplete path that prevents current flow.

open

What is the industry standard of reversing a three phase motor?

switching L1 & L3